Salmon gear - recommendations

Last fall was my first season salmon fishing on the rivers here in the
Lower Mainland (Vancouver BC), drift fishing with my old surf rod and
penn reel, landing chinook of up to 30 lbs.

This year I'd like to try fly fishing for pink salmon, but fear that my
5/6 weight trout kit isn't up to the job. So I need some heavier-duty
fly kit for the bigger fish (10-25 lbs). But I have no clear idea how
much heavier its got to be...

Would an 9ft 8-weight be ridiculously inadequate? Or do I have to be
looking at a double-handed rod?

Quite a general question, I know, but all advice and experience is
appreciated.

/S